An atom has three full orbitals in its second energy level.

How many electrons are present in the second energy level of the atom?

6

12

3

9

Why is water essential to living things?

Find the ratio of the effusion rate of hydrogen gas to the effusion rate of krypton gas. express the ratio of effusion rates to four significant figures.

E) Convert the following units as instructed: 1. 54 g →? kg 2.12 ML →? KL 3. 5 cg →? mg 4. 3 um →? m 5. 5.06 L →? mL

Which of the following statements describe a system at equilibrium? There may be multiple correct answers. Select all that apply. Group of answer choices The rate of the forward reaction has decreased to zero.

Use convection in a sentence

Which of the following is not a source of air pollution related to human activities

You see rainforests a is far as the eye can see It rains every day and the humidity is fiercel Where might you be? Polar climate Tropical climate Subtropical climate Temperate climate

2. A balloon is dunked into a tank of cold water. How will this affect the size of the balloon?

Which of the following correctly describes a compound?

If the [H+] of a solution is 1.0 x 10 to the power of - 2 mol/L the pH is: (pH = - log (H+] 1 12 -2 2 chemistry